27 250000000000 | = | ( | 1 250 | − | x | ) | ( | 67 10000 | − | x | ) |
| 方程右边 = | 1 250 | ( | 67 10000 | − | x | ) | − | x | ( | 67 10000 | − | x | ) |
| = | 1 250 | × | 67 10000 | − | 1 250 | x | − | x | ( | 67 10000 | − | x | ) |
| = | 67 2500000 | − | 1 250 | x | − | x | ( | 67 10000 | − | x | ) |
| = | 67 2500000 | − | 1 250 | x | − | x | × | 67 10000 | + | x | x |
| = | 67 2500000 | − | 107 10000 | x | + | x | x |
27 250000000000 | = | 67 2500000 | − | 107 10000 | x | + | x | x |